Dr. April L. Marquardt, MD

  • Ann Arbor, MI
  • Rheumatologist
NPI1235352311PAC ID7719058536
Medicare services, 2024
402
Medicare patients, 2024
203
Part D claims, 2024
3,638
Publications
2
Hospital affiliations
5
Practice address
1500 E Medical Center Dr, Ann Arbor, MI 48109
Practice phone
Call (734) 936-4000
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

University Hospital

School-Based Health Center · Ann Arbor, Michigan

See all 9 affiliations

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Dr. April L. Marquardt is a rheumatologist in Ann Arbor, Michigan

Dr. Marquardt practices at University Hospital in Ann Arbor, Michigan.

Dr. Marquardt's NPI, 1235352311, was assigned on April 10, 2007. Dr. Marquardt graduated from Ohio State College of Medicine in 2003. Dr. Marquardt holds Michigan license 4301104281.

NPI and contact details
Medicare PAC ID
7719058536
NPI enumeration date
April 10, 2007
NPI status
Active
Accepts Medicare assignment
Yes
Offers telehealth
Yes
Practice phone
(734) 936-4000
Professional email
Get email
Personal email
Get email
Mobile number
Get number
Sex
Female
Estimated age
49
Medical school graduation
2003

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. April L. Marquardt practices at University Hospital in Ann Arbor, Michigan

Dr. Marquardt's primary practice is University Hospital, at 1500 E Medical Center Dr, Ann Arbor, MI 48109. The practice phone is (734) 936-4000.

  • University Hospital
    1500 E Medical Center Dr, Ann Arbor, MI 48109Phone(734) 936-4000

Source: Dmand AI Affiliation Data

Dr. April L. Marquardt is affiliated with 7 sites of care and 2 medical groups

Dr. Marquardt's primary practice is University Hospital in Ann Arbor, Michigan. Dr. Marquardt is also affiliated with University Hospital. The medical group on file is University of Michigan Health. Dmand AI also links Dr. Marquardt to 4 more hospitals, 1 group practice or clinic and 1 medical group, each named with a free account. Dr. Marquardt's employer is on file too: a school & student health.

See all 9 affiliations for Dr. Marquardt

Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Dr. April L. Marquardt's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Marquardt practices, 7 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
University HospitalAvailable with a free account
+6 more sites and 1 medical groupAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. April L. Marquardt is one of 203 rheumatologists in Michigan

Rheumatology is Dr. Marquardt's primary specialty in the NPI Registry, under taxonomy code 207RR0500X. Dr. Marquardt is board certified in rheumatology by the American Board of Internal Medicine. Dmand AI has Dr. Marquardt's licenses on file in 3 states: Michigan, Ohio and Nevada.

Specialties and state licenses

  • Rheumatology, MichiganPrimaryLicense 4301104281 · 2013 to 2027 · taxonomy 207RR0500X
  • Ohio licenseLicense 35086828 · 2003 to 2026
  • Nevada license2010 to 2023

Clinical focus

Dmand AI lists arteritis, arthritis, fibromyalgia and chronic pain, gout, joint arthropathy, joint pain, lupus and muscle pain, fibromyalgia, and limb pain among the conditions Dr. Marquardt treats.

Rheumatologists near Dr. Marquardt

Counts of rheumatologists with a Dmand AI profile, by place and practice. Each opens the list.

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Dr. April L. Marquardt billed Medicare for 402 services in 2024

CMS data shows 402 Medicare services from Dr. Marquardt across 2 procedure codes in 2024, all of them office visits, for 203 Medicare patients. Medicare paid $35,561 for them.

Medicare services, 2024402
Medicare patients203
Paid by Medicare$35,561
Procedure codes2

Dr. Marquardt's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Office and hospital visits
2023: 5072024: 40221%

Where Dr. Marquardt's Medicare services took place, 2024

  • In an office37593%
  • In a facility277%

Dr. Marquardt compared with the Michigan median for rheumatologists, 2024

  • Dr. Marquardt
  • Michigan median
Medicare services
402vs 400Close to median
Medicare patients
203vs 16225% above
Part D claims
3,309vs 1,1992.8 times

Medians across 198 rheumatologists in Michigan with Dmand AI profiles that report each measure.

Dr. Marquardt's most billed Medicare procedure codes, 2024

CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.

See all procedures by Dr. Marquardt

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. April L. Marquardt treated 203 Medicare patients in 2024, average age 69

CMS counts 203 Medicare patients who saw Dr. Marquardt in 2024. The largest group is 65 to 74, with 101 patients. 75% of them have arthritis, and 65% have high cholesterol. 17% are also on Medicaid. Their average risk score is 1.55, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.

Across all payers, Dmand AI patient panel data puts Dr. Marquardt's median patient age at 61, with 74% women.

Medicare patients, 2024203
Average age69
Average risk score1.55
Also on Medicaid17%

Dr. Marquardt's Medicare patients by age, 2024

Dr. Marquardt's Medicare patients by sex, 2024

  • Women15978%
  • Men4422%

Chronic conditions among Dr. Marquardt's Medicare patients, 2024

  1. Arthritis75%
  2. High cholesterol65%
  3. High blood pressure64%
  4. Mood disorders31%
  5. Depression29%
  6. Anxiety27%
  7. Osteoporosis24%
  8. Ischemic heart disease23%

Share of Medicare patients with each condition. A patient can have several.

Dr. Marquardt's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 61

Patient panel by sex, all payers

  • Women74%
  • Men26%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. April L. Marquardt wrote 3,638 Medicare Part D claims in 2024

In 2024, Dr. Marquardt wrote 3,638 Medicare Part D claims for 459 patients. 81% of them were for generic drugs. CMS names the drug for 3,309 of them, across 40 drugs with 11 or more claims each, at $3,845,747 in total drug cost. In 2023, CMS named 2,895 claims across 37 drugs.

Part D claims, 20243,638
Drugs named by CMS40
Total drug cost$3.8M
Part D patients459

Dr. Marquardt's Part D claims by kind of drug, 2024

  • Generic2,947 claims81%
  • Brand-name659 claims18%
  • Other32 claims1%

Dr. Marquardt's most prescribed drugs by claims, 2024

CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.

Drug classes CMS tracks in Dr. Marquardt's Part D claims, 2024

  • Opioids3%126 of 3,638 claims
  • Antibiotics0%15 of 3,638 claims

Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 2,8952024: 3,30914%

Drugs named by CMS: 40 in 2024, 37 in 2023.

See all prescribing by Dr. Marquardt

Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data

Dr. April L. Marquardt offers telehealth to Medicare patients

Dr. Marquardt accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Marquardt as offering telehealth.

Accepts Medicare assignment
Yes
Offers telehealth
Yes

Source: Doctors and Clinicians National Downloadable File (CMS)

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Dr. April L. Marquardt has 2 publications on record

Dmand AI links 2 papers to Dr. Marquardt. Dr. Marquardt's most frequent co-authors are Kevin V. Hackshaw, MD and Rajaie Ahmd Namas, MD.

Papers2

Dr. Marquardt's most frequent co-authors

Recent publications by Dr. Marquardt

See all 2 publications and co-authors

See who Dr. Marquardt researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Marquardt works with, so you can find a warm path to the right rheumatologists.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Dr. April L. Marquardt has 2 awards and honors on record

Dmand AI lists 2 awards for Dr. Marquardt, most recently ACR Fellow in 2014.

Awards and honors for Dr. Marquardt

  1. 2014
    • ACR Fellow
  2. Undated
    • CMS Stage 1 EHR

Source: Dmand AI Professional Profile Data

Dr. April L. Marquardt graduated from Ohio State College of Medicine

Dr. Marquardt graduated from Ohio State College of Medicine in 2003. Dr. Marquardt is a member of ACR.

  1. Medical schoolOhio State College of Medicine
  2. Board certified in rheumatologyAmerican Board of Internal Medicine

Source: Dmand AI Professional Profile Data

Dr. April L. Marquardt accepts plans from 13 insurance carriers

Dr. Marquardt is in network with 13 carriers, including Aetna, Health Alliance Plan and Priority Health. Medicare plans come from the most carriers, 10. Check the plan with the practice before a visit.

  • Aetna
  • Health Alliance Plan
  • Priority Health
  • United Healthcare
  • Blue Cross Blue Shield of Michigan
  • HCSC
  • Molina
  • Blue Cross Blue Shield of Massachusetts
  • +5 more carriersWith a free account

Plan types Dr. Marquardt accepts, by number of carriers

  1. Medicare10
  2. HMO8
  3. PPO8
  4. POS6
  5. EPO3
  6. Medicaid3

Source: Dmand AI Insurance Network Data

Sources for Dr. April L. Marquardt's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Awards and committee rolesDmand AI Professional Profile Data
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Dr. April L. Marquardt

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

What is Dr. April L. Marquardt's NPI number?

Dr. April L. Marquardt's NPI number is 1235352311. It was assigned on April 10, 2007, and it is active in the NPI Registry.

What kind of doctor is Dr. April L. Marquardt?

Dr. April L. Marquardt is a rheumatologist in Ann Arbor, Michigan. The primary specialty in the NPI Registry is Rheumatology Physician (taxonomy code 207RR0500X).

Where does Dr. April L. Marquardt practice?

Dr. Marquardt practices at 1500 E Medical Center Dr, Ann Arbor, MI 48109. Dr. Marquardt's primary practice is University Hospital in Ann Arbor, Michigan. Dmand AI also links Dr. Marquardt to 4 hospitals, 1 group practice or clinic and 1 medical group.

What is Dr. April L. Marquardt's office phone number?

The practice phone on file for Dr. Marquardt is (734) 936-4000.

What is Dr. April L. Marquardt's medical license number?

Dr. Marquardt holds Michigan license 4301104281, one of the licenses on file in 3 states.

Which states has Dr. April L. Marquardt been licensed in?

Dmand AI has state licenses on file for Dr. Marquardt in Michigan (2013 to 2027), Ohio (2003 to 2026) and Nevada (2010 to 2023).

Which hospitals is Dr. April L. Marquardt affiliated with?

Dr. Marquardt is affiliated with University Hospital. Dmand AI links Dr. Marquardt to 4 more hospitals.

What medical group is Dr. April L. Marquardt part of?

Dr. Marquardt is linked to University of Michigan Health. Dmand AI links Dr. Marquardt to 1 more medical group.

Does Dr. April L. Marquardt accept Medicare?

Yes. CMS data shows Dr. Marquardt billed Medicare for 402 services in 2024, and Dr. Marquardt accepts Medicare assignment.

Does Dr. April L. Marquardt offer telehealth?

Yes. The CMS Doctors and Clinicians file lists Dr. Marquardt as offering telehealth services.

Show 9 more questionsShow fewer questions

How many Medicare patients does Dr. April L. Marquardt see?

CMS counts 203 Medicare patients who saw Dr. Marquardt in 2024, with an average age of 69.

Is Dr. April L. Marquardt board certified?

Yes. Dr. Marquardt is board certified in rheumatology by the American Board of Internal Medicine.

What services does Dr. April L. Marquardt bill to Medicare?

In 2024, Dr. Marquardt's most billed Medicare services were office visit, established patient (99214) and office visit, new patient (99204).

Where did Dr. April L. Marquardt go to medical school?

Dr. Marquardt graduated from Ohio State College of Medicine in 2003.

What drugs does Dr. April L. Marquardt prescribe most?

In 2024 Medicare Part D data, Dr. Marquardt's most prescribed drugs by claims were Methotrexate, Hydroxychloroquine Sulfate and Prednisone.

How long has Dr. April L. Marquardt been practicing?

Dr. Marquardt graduated from medical school in 2003, 23 years ago.

Does Dr. April L. Marquardt do research?

Dmand AI links 2 publications to Dr. Marquardt.

Who does Dr. April L. Marquardt publish with?

Dr. Marquardt's most frequent co-authors are Kevin V. Hackshaw, MD (1 shared paper) and Rajaie Ahmd Namas, MD (1 shared paper).

What insurance does Dr. April L. Marquardt accept?

Dr. Marquardt is in network with 13 carriers, including Aetna, Health Alliance Plan and Priority Health. Medicare plans come from the most carriers, 10. Check the plan with the practice before a visit.

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